buyer/seller integrity question

So he made you an offer that was lower than your asking price?

I would say that he was the one that set the value of the car and both parties agreed.

Do you think if He was offered 20k for the car by his neighbor, he would contact you and pay you some money back to you because he got more than he paid for it?

I read your add and the guy was very eager to make the deal and he set the price that you agreed to.

Its his car now.